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Fast synthesis sub-band filtering method for digital signal decoding

a filtering method and sub-band technology, applied in speech analysis, special data processing applications, broadcast receiving circuits, etc., can solve the problem that the sub-band synthesis filter is one of the most computationally intensive blocks, and achieve the effect of reducing the cost of decoding and less complexity

Inactive Publication Date: 2012-10-30
STMICROELECTRONICS ASIA PACIFIC PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly reduces the number of addition operations, from 32×16 to 2×16, resulting in a 46.875% reduction in overall computational power, making the decoding process more efficient and cost-effective.

Problems solved by technology

The sub-band synthesis filter is one of the most computationally intensive blocks of the MPEG audio decoder.

Method used

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  • Fast synthesis sub-band filtering method for digital signal decoding
  • Fast synthesis sub-band filtering method for digital signal decoding
  • Fast synthesis sub-band filtering method for digital signal decoding

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Embodiment Construction

[0030]FIG. 1 is a block diagram illustrating the major components of an MPEG audio encoder circuit 2 constructed in accordance with the aforementioned standards document. In the figure, an input signal 4, comprising a pulse code modulated (PCM) signal having a 48 kHz sampling frequency and a sample size of 16 bits per sample, is provided as input to the single channel encoder 2. The input signal is first mapped from the time domain into the frequency domain by a sub-band filter bank 8. The resulting coefficients are normalized with scale factors which may be transmitted as side information. The coefficients thus obtained are then quantized and entropy encoded by a quantizer and encoding circuit 10. Masking thresholds of the quantization errors are calculated based on psychoacoustic values provided by a psychoacoustic model 14 to control the quantization step. The bit allocation is transmitted as side information. The coded signal is then multiplexed by a frame packing circuit 12 and...

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Abstract

In order to reproduce audio signals which have been compressed or encoded for storage or transmission using, for example, MPEG audio encoding, a synthesis sub-band filter is employed which performs an inverse modified discrete cosine transform. The computational cost of the IMDCT implementation is reduced by pre-calculating arrays of sum and difference data. The arrays of sum and difference data are then used in two separate transform calculations, the results of which can be used in the generation of pulse code modulation audio data.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of and claims the benefit of U.S. patent application Ser. No. 09 / 486,582, filed Jul. 10, 2000, now pending, which application is incorporated herein by reference in its entirety, and which application is the National Phase of International Application No. PCT / SG97 / 00037, filed Aug. 29, 1997, incorporated herein by reference in its entirety.BACKGROUND[0002]1. Technical Field[0003]This invention relates to digital signal decoding for the purposes primarily of audio reproduction. In particular, the invention relates to enhanced synthesis sub-band filtering during decoding of digital audio signals.[0004]2. Description of the Related Art[0005]In order to store or transmit data representing audio signals it is often desirable to first encode or compress the data so as to enable it to be stored or transmitted more efficiently. Decoding the data requires that the stored or transmitted data be reconstructed into a...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06F17/00G10L19/02H04H40/18
CPCG10L19/0208H04H40/18
Inventor GEORGE, SAPNAYANG, HAIYUN
Owner STMICROELECTRONICS ASIA PACIFIC PTE